Say c first.

If C is lying, then A is 1 year, and A is definitely smaller than C, which contradicts the previous article.

So what C said is true.

C is bigger than A, and A is not 1 year.

If A is telling the truth, A >: B, A 4 years old, B 3 years old. This contradicts the previous inference, so what A said is false. B is greater than a.

B and C are both older than A, but A is less than one year old.

∴ already two years old. B I'm 4 years old this year. C is 3 years old this year.

The rest will be 1 year.